Severing mechanism



July- 14,1936. W. ZWGYER M7243 SEVERING MECHANISM Original Filed Nov. 28, 1933 2 Sheetsi-Sheet l July 14, 1936 W. R. zWoYl-:R 2,@477243 SEVERING MECHANISM Original Filed Nov. 28, 1935 2 Sheets-Sheet 2 INVENTQR Patented July 14, 1936 PTENT ortica SEVEG WC i sin Waiter may Zwoyer, Maywood, N. d., assigner, by

menne assients, to Transparent-Wrap Mace @Dorpen-ation, New llork, N. Y., a corporation oi New York @riginai application November 28, i033, herinll Nn. 700,097, maw iPtttJlifi N10. 1,936,4i22, @di .Mnary i, 1035. Divided d appiicntion November 30, 119%, dat No.. "355.i23. @a y ll, mit

This invention relates to mech for cutting material produced in strip form into a plurality of separate parts by severing the material crosswise of the strip, and is particularly adapted for use as a part of any more comprehensive machine in which there maybe a need to include such a mechanism, as, for example, the machine disclosed in United States application, Serial No. 700,091, ied November 28, 1933 (now Patent No. 1,986,422, dated January l, 1935), oi' which this application is a division.

The invention consists of a severing device comprising a pair of cutting knives disposed substantially at right angles to each other, the edge .of each blade being so located as to extend at an acute angle with respect to the adjacent surface of the opposed blade, and, preferably, the knives may beprovided with means for moving them towards and from each other comprising a rack for each knife and a common driving pinion for the racks, and, if desired, one of the knives may be provided with. means whereby it may be yieldingly moved in a direction substantially at right angles to its direction of movement towards the other when the knives are forcibly pressed together whereby they may be caused to cut with a scissors-like action when severing a strip of material.

Referring to the drawings which are illustrative of one form of the inventionf Figure 1 is a perspective view of. a. part of a machine including severing mechanism embodying the invention and its operating means.

Fig. 2 is a top view, partly in horizontal section, of parts of a machine including severing mechanism embodying the invention. 4

Fig. 3 is a View similar to Fig. 2, but showing the parts in different positions.

sented as having been cut through by the blades ing mechanism only will .be disclosed and claimed herein. This severing mechanism is designated generally where it appears in the various figures of the drawings by the reference character K.

Details of the cutting mechanism are best illustrates. in Figs. 2, a, i and. 5. in these figures the upper knife is indicated by the reference numeral M0 and the lower knife by the numeral i i i. The lower knife (as best seen in Fig. 6) is somewhat angularly formed so that as it passes under the upper knife it wiil have a slight shearing action. nIlihe upper knife is also given a slight tl-shape (as best seen in Fig. .5) but at right angles to the lower knife, so that the upper knife in fact rises during the cutting stroke against the tension of springs i100. suitably housed in the upper knife Vcarrier Illlb. The operating'mechanism for the knives in the duplex form shown is connected with them at their middles and the two projecting ends are designed to cut: two parallel-strips of material G, G (Fig. 5).' One such strip is.

vstrips G, G. between them and. to close them to sever the strips.

`The driving mechanismfor the knives is best seen in Figs. 1 and 4. Referring to these gures it will be seen that thereis mounted on the base A of the machine a mechanism which may be driven from any desired source of power, not shown, said mechanism comprising a cam shaft 68 carrying a rotaryl cam 69 provided with a cam track 1 I', shown in dotted lines in Fig. 1, in which cam track is mounted a cam roller 12 connected by a pitman 13 to the short arm of a bell-crank lever 14 mounted in a bearing 15 on the table B. The cam movement is such as to reciprocate the pitman 13 in a vertical direction, which movement, being translated by the bell-crank lever, insures a horizontal reciprocation of an elongated rack 11. This rack 11, which is best seen in Figs. 1 and 4, transmits motion to the pinion H1, winch in turn meshes with a similar pinion H8, to which is fixed a shaft H9 carrying the pinion H6 midway of its length, as shown in dotted lines in Figui and in plan in Figs. 2 and 3. The proportions of the gears are so designed that the reciprocations of the rack 11 aiord the necessary opening and closing movements of the knives, and these are best timed to close and sever the strips G while they are held stationary by strip feeding means not herein specicaliy disclosed and claimed.

What is claimed isz- 1. A mechanism for severing material from a strip comprising a pair oi' shearing blades having their respective edge opposing surfaces dis- 20 the other will bring their edges in a point-topoint contact and further movement of the same blade in the same direction will tend to cause the other to move in a direction such that the point of contact between the blades will travel along the line of intersection between the planes of their edge opposing surfaces whereby the device may cut with a scissors-like action.

2. A severing mechanism, as defined by claim l, of which the edge opposing surfaces are disposed in planes which intercept at right angles.

3. A severing mechanism, as defined by claim l, of which the respective blades move in directions parallel with the planes of their edge opposing surfaces.

4. A severing mechanism, as defined by claim 1, comprising means for forcibly moving one of the blades towards the other and means for yieldingly opposing the movement of the other blade.

WAL'IER RAY zWoYER. 

